Textile machine with device for forming a yarn reserve on a bobbin tube during the winding operation and a yarn tension sensor cooperating with the device

ABSTRACT

A device for forming a yarn reserve on a bobbin tube during the winding operation includes an arm turnable about an axis transverse to the axis of the bobbin tube. The arm engages during its turning in one direction with its hooked end the yarn so that the yarn is wound in one direction on one end of the bobbin tube and a catch member on the arm engages during the turning thereof in this one direction a surface of a disc rotating about an axis parallel to the tube axis, which surface is inclined to the axis of rotation of the disc so that during such rotation the arm is turned in the opposite direction causing corresponding winding of the yarn at the one end of the bobbin tube. A yarn reserve is thus formed at the one end of the bobbin tube in which a plurality of turns are wound in one direction and a following plurality of turns is wound in the opposite direction extending over the first-mentioned turns. The bobbin tube is mounted on support tiltable between a winding position and a release position and the textile machine is also provided with a yarn tension sensor cooperating with a cutter to cut the yarn when the tension thereof slackens. The sensor is rendered inoperative when the tube support is tilted to the release position and rendered operative after a new bobbin tube on the support is placed in winding position.

United States Patent Gleyze 1 Aug. 12, 1975 [54] TEXTILE MACHINE WITI-I DEVICE FOR 3,823,884 7/1974 Sartori 242/18 PW FORMING A YARN RESERVE ON A 3,858,816 l/1975 Corbiere 242/18 PW BOBBIN TUBE DURING THE WINDING OPERATION AND A YARN TENSION SENSOR COOPERATING WITH THE DEVICE [75] Inventor: Jean Gleyze, St. Pierre de Colombier, France [73] Assignee: Societe Civile Textile dite Socitex,

Lyon, France [22] Filed: June 24, 1974 [21] Appl. No.: 482,288

Related US. Application Data [63] Continuation-impart of Ser. No. 471,974, May 21,

[30] Foreign Application Priority Data June 25, 1973 France 73.23177 Feb. 28, 1974 France 74.06962 [52] US. Cl 242/18 PW; 242/18 DD; 242/18 A [51] Int. Cl. B65h 54/34 [58] Field of Search 242/18 PW, 18 DD, 18 R,

242/18 A, 19, 35.5 R, 35.5 A

[56] References Cited UNITED STATES PATENTS 2,791,384 5/1957 Furst..... 242/19 X 3,065,921 11/1962 Furst 242/18 PW 3,507,453 4/1970 Scragg et a1. 242/18 A 3,682,403 8/1972 Willis r 242/18 A 3,791,126 2/1974 Kose 242/18 R X 3,801,030 4/1974 Kobatake et a1 242/18 R Primary ExaminerStanley N. Gilreath Attorney, Agent, or FirmMichae1 S. Striker [5 7] ABSTRACT A device for forming a yarn reserve on a bobbin tube during the winding operation includes an arm turnable about an axis transverse to the axis of the bobbin tube. The arm engages during its turning in one direction with its hooked end the yarn so that the yarn is wound in one direction on one end of the bobbin tube and a catch member on the arm engages during the turning thereof in this one direction a surface of a disc rotating about an axis parallel to the tube axis, which surface is inclined to the axis of rotation of the disc so that during such rotation the arm is turned in the opposite direction causing corresponding winding of the yarn at the one end of the bobbin tube. A yarn reserve is thus formed at the one end of the bobbin tube in which a plurality of turns are wound in one direction and a following plurality of turns is wound in the opposite direction extending over the first-mentioned turns. The bobbin tube is mounted on support tiltable between a winding position and a release position and the textile machine is also provided with a yarn tension sensor cooperating with a cutter to cut the yarn when the tension thereof slackens. The sensor is rendered inoperative when the tube supper; is tilted to the release position and rendered operative after a new bobbin tube on the support is placed in winding position.

11 Claims, 12 Drawing Figures PATENTEU mi 21975 SHEET PATENTED AUG] 2I975 SHEET FIG. 2

PATENTED AUG 1 21975 SHEET FIG. 4

PATENTEB mi 21975 SHEET FIG. 5

PATENTEUAUBIZIHYS 3,899,140 SHEET 6 PATENTEU AUG 1 21975 SHEET PATENTEnAuclzlszs 3,899,140-

SHEET 8 SHEET PATENTED AUG 1 2I975 TEXTILE MACHINE WITH DEVICE FOR FORMING A YARN RESERVE ON A BOBBIN TUBE DURING THE WINDING OPERATION AND A YARN TENSION SENSOR COOPERATING WITH THE DEVICE CROSS-REFERENCE TO RELATED APPLICATION The present application is a continuation-in-part application of the application Ser. No. 471,974 filed May 21, 1974.

BACKGROUND OF THE INVENTION The present invention relates to textile machines and more specifically to a textile machine provided with a device for forming a yarn reserve on a bobbin tube at the start of winding a bobbin package thereon.

A reserve, also called transfer or attachment tail is generally formed at the start of winding a yarn on a bobbin tube. The object of this reserve, which consists of a few turns wound about one end of the bobbin tube, is to enable the yarns of several bobbins to be joined during unwinding so as to permit a continuous unwinding of the yarn without stopping, when passing from one bobbin to another.

Depending on the contemplated application this reserve may be formed by a single group of turns or by two groups of turns wound in opposite directions.

A device for forming a yarn reserve has already been disclosed in the U.S. Pat. No. 3,065,92 l. However, this device requires numerous components and is therefore costly to produce and to maintain in proper operating condition.

A semi-automatic device for forming a reserve is also described in the French Pat. No. 2,082,909, which device has however two disadvantages, that is, it does not permit to produce a so-called protected reserve in which successive portions of the reserve are wound in opposite directions and the length and extent of the reserve are determined by the operator and are thus variable. i

The present invention relates also to a sensor sensing the yarn tension and cooperating with a cutter to cut the yarn when the tension thereof slackens. This sensor is rendered inoperative when the support of the bobbin tube is tilted, after a full bobbin package is mounted thereon, to a release position and rendered operative after a new bobbin tube on the support is placed in winding position.

SUMMARY OF THE INVENTION It is an object of the present invention to provide in a textile machine a device for forming a yarn reserve, and which avoids the disadvantages of such devices known in the art.

It is a further object of the present invention to provide in a textile machine such a device which is simple in construction and in which a reserve may be formed having a plurality of turns wound in one direction and a following plurality of turns wound in the opposite direction over the first-mentioned turns.

It is an additional object of the present invention to provide in a textile machine of the aforementioned kind a yarn tension sensor cooperating with a cutter to cut the yarn at the entrance of the machine when the yarn tension slackens, and in which the sensor is rendered inoperative when a bobbin tube with a full yarn package wound thereon is tilted by its support from a winding to a release position, in which the tube with the full yarn package mounted thereon is released from the machine, and in which the sensor is to be rendered operative when the tube support with an empty bobbin tube is again placed into winding position.

With these and other objects in view, which will become apparent as the description proceeds, the device according to the present invention for forming a yarn reserve at one end of the bobbin tube mainly comprises support means supporting the bobbin tube rotatable about its axis and tiltable about a pivot axis substantially parallel to the tube axis between a winding and a release position. In the winding position the tube is driven about its axis so that a yarn may be wound thereon. A shaft extending transverse to the aforementioned pivot axis has a reserve arm fixed at one end to and projecting substantially normal from this shaft and the shaft with its reserve arm thereon is turnable between a rest and a turned position by transmission means between the support means and the shaft, which turns the latter and the arm thereon from its rest to its turned position during tilting of the support means from the winding to the release position. Yieldable locking means are also provided for locking the aforementioned arm in its turned position and for releasing the arm when the support means is moved back to the winding position. The reserve arm has at the free end thereof a hooked yarn guide adapted to engage a yarn .during turning of the arm from the turned to the rest position to thereby wind the yarn on one end of the bobbin tube and to form a yarn reserve thereon. The shaft and the arm thereon are biased to return from the turned to the rest position after the locking means releases the arm, and engaging means carried by the arm intermediate the ends of the latter are arranged to engage an engaging face on a disc which is rotated about an axis parallel to the tube axis, which engaging face is inclined to the axis of rotation of the disc, so that as the engaging means on the arm engages the engaging face, the arm is turned against the force of the biasing means in the opposite direction whereby the yarn is wound in the corresponding opposite direction at the end of the bobbin tube for a few turns which thus will overlie the first turns of the yarn reserve.

The textile machine according to the present invention includes also sensor means for sensing the presence and tension of the yarn and this sensor means cooperates with cutting means upstream of the sensor means for cutting the yarn when the sensor means senses slacking of the yarn. Means are also provided for rendering the sensor means inoperative during movement of the support means from the winding to the release position and for rendering the sensor means operative during winding of the yarn on the bobbin tube to form a yarn package thereon.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof ,will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. I is a schematic perspective view of a unit for changing bobbins and loading empty bobbin tubes on a textile machine and illustrating also a first embodiment of a device for forming a reserve tail or yarn reserve on a new empty bobbin tube placed on the device;

FIG. 2 is a schematic perspective view illustrating certain embodiments of the device for moving the reserve arm between the positions thereof, which elements have been omitted, for clarities sake, from FIG.

FIG. 3 is a partial perspective view similar to FIG. 1 showing the bobbin tube supporting means moved to a release position and a full bobbin tube received in a cradle;

FIG. 4 is a partial perspective view similar to FIG. 1 and showing a new empty bobbin tube placed on the bobbin tube supporting means while the latter is moved back to the position shown in FIG. 1;

FIGS. 5 and 6 are partial perspective views illustrating an empty bobbin tube in the position as shown in FIG. 1 and illustrating further the cooperation of the reserve arm with a toothed periphery of one of the side plates of the bobbin tube supporting means for forming a yarn reserve;

FIG. 7 is a perspective view showing the various elements of the device in the same position as shown in FIG. 1 during winding of the yarn on an empty bobbin tube to form a yarn package thereon;

FIG. 8 illustrates in a side view parts of a second embodiment of the device for forming a yarn reserve which is especially adapted to form a protected yarn reserve;

FIG. 9 is an end view of the parts shown in FIG. 8, as viewed in the direction of the arrow A of FIG. 8;

FIG. 10 is a perspective view schematically illustrating the sensor for sensing the yarn tension and the elements cooperating therewith for rendering the sensor inoperative during movement of the bobbin tube supporting means from the winding to the releasing position and for rendering the sensor operative during winding of a yarn on an empty bobbin tube placed in winding position to form a yarn package thereon;

FIG. 11 is an exploded view of some of the elements shown in FIG. 10; and

FIG. 12 is a schematic side view showing the transmission between the bobbin tube supporting means and certain elements shown in FIGS. 10 and 11.

DESCRIPTION OF THE PREFERRED EMBODIMENTS -ing to the present invention comprises a plurality of such units as illustrated in FIGS. l-7 arranged in at least one row adjacent each other, but for the convenience of the description only one of the units has been represented.

As shown in FIG. 1 the yarn l is continuously supplied from a yarn supply means or supply duct 2, for example the outlet of an oven for the heat treatment in a texturizing operation and the yarn passes through a reciprocating yarn guide 3 to be wound on the bobbin tube 4 which is rotated by frictionally engaging a drive cylinder 5. The yarn guide 3 is reciprocated in the direction of the axis of the tube in a known manner, not forming part of the invention and therefore not shown in the drawing, and the drive cylinder 5'is continuously rotated about its axis by drive means, likewise not shown.

Both ends of the tube are gripped between side plates 6 and 7 of bobbin supporting means comprising a pair of spaced substantially parallel arms 8, carrying at their free ends thereof the aforementioned side plates or tube engaging means 6 and 7 for rotation about the axis thereof, and the arms are connected at the other ends thereof to a shaft 9, extending substantially parallel to the axis of the tube 4 mounted between the side plates, for simultaneous pivoting movement about the axis of the shaft 9 during turning of the latter. The unit shown in FIG. 1 includes further a cradle having two arms 11, each provided at the free end thereof with an end portion 12 of substantially semicircular configuration having a radius slightly larger than the radius of the tube 4 and the opposite ends of the cradle arms 11 are freely turnable mounted on the shaft 9. v

A lever 13 isfixed at one end thereof to the shaft 9 so that upon manually operating the lever 13 in the manner indicated in FIG. 1, the arms 8 of the bobbin tube supporting means may be moved from the yarn winding position shown in FIG. 1 to the release position as shown in FIG. 3. During such movement of the arms 8, inwardly extending projections 27 on the arms will engage the cradle arms 11 to move the latter to the position as shown in FIG. 3 in which the cradle arms are prevented from turning further by stops, not shown in the drawing.

As the arms 8 approach, during theirpivoting about the axis of the shaft 9, the position as shown in FIG. 3, at least one of the arms, for instance the left arm as shown in FIG. 1, is engaged, at its inner side face, by the inclined face 26a of a stationary cam 26 so that the upper end of the arm 8 carrying the side plate 6 is flexed in outward direction, whereby the bobbin tube 4 clamped between the side plate 6 and 7 is released, and the opposite ends of the tube 4 are received in the semi-circular end portions 12 of the cradle arms, as shown in FIG. 3. The cradle arms 1 1 will remain in the position as shown in FIG. 3 upon returning of the arms 8 by means of the lever 13 to the winding position shown in FIG. 1, and the cradle arms 11 may subsequently be manually turned to the position shown in FIG. 1, or torsion springs, not shown in the drawing, wound about the shaft 9 and engaging the cradle arms may be used to return the cradle arms to the position as shown in FIG. 1 after removing of a full bobbin 14 from the semi-circular end portions 12 of the cradle arms. Such torsion springs have to be constructed in such a manner that the cradle arms will remain in the position as shown in FIG. 3, as long as a full bobbin is supported thereon, but will be returned to the position as shown in FIG. 1, when the full bobbin is removed from the semi-circular end portions 12.

The unit includes further temporary yarn recovering means comprising a receptacle 21 mounted on the support 22 and connected to a source of vacuum, not shown in the drawing, and a suction tube communicating with the receptacle 2] and having an open end 20 adjacent the shaft9, and cutting means-23 stationarily mounted on the support 22 adjacent the opening 20 of the suction tube.

The unit includes further a device for forming a yarn reserve or attachment tail at the end of the bobbin tube 4 at the start of the winding operation. This device includes a reserve arm fixedly connected at one end thereof to a shaft 16 having an axis extending transverse to the axis of the tube 4. The reserve arm 15 projects substantially normal from the upper end of the shaft 16 and is provided at its free end with a hook portion 15a adapted to engage a yarn 1 extending from the yarn supply tube 2 to the suction opening 20, in the manner as will be described later on, during turning of the reserve arm 15 with the shaft 16 about the axis of the latter. An arm 29 fixed to the lower end of the shaft 16 projects transverse to the shaft axis and carries at its free end a roller follower 30 engaging a cam 31 as shown in FIG. 2. A coil spring, not shown in FIGS. 1-7, wound about the shaft 16 and engaging with one end thereof the arm 15 and with the other end a stationary support biases the arm 29 towards its rest position so that the roller follower 30 carried thereby will remain in continuous engagement with the peripheral surface of the came 31. The cam 31 is connected by transmission means to the shaft 9 so that the cam is turned during turning of the shaft 9 by the lever 13 as the arms 8 of the bobbin tube supporting means are moved between the aforementioned positions thereof. Such transmission means may include a pulley 32 coaxially fixed to the cam 31, a pulley 24 (FIG. 1) fixed to the shaft 9 for turning therewith, and an endless belt 25 extending over the pulleys 24 and 32 and being guided between the pulleys over guide rollers, not shown in the drawing. The belt 25 may be a toothed belt and the pulleys 24 and 32 may be provided with corresponding teeth to prevent slippage of the belt with respect to the pulleys. The reserve arm 15 carries between the opposite ends thereof engaging means in form of a catch member 17 tiltably connected at its upper edge to the upper edge of the arm 15 on the face thereof which trails during movement of the arm 15 from the rest position, shown in FIG. 1, to the turned position, shown in FIG. 3. The catch member 17 may be held in the position as shown in FIG. 1, in which a lower portion of the catch member extends downwardly beyond the arm 15, simply by gravity, or a torsion spring wound about the tilting axis of the catch member 17 engaging with opposite ends the upper face of the arm 15 and the rear face of the catch member may be provided to yieldably hold the catch member 17 in the position as shown in FIG. 1. The catch member 17 is adapted to cooperate, in a manner as will be described later on in detail, with slanted grooves 19a provided on the peripheral surface of wheel 19 fixed to a shaft 18 extending substantially parallel to the axis of the cylinder 5 and being driven by means, not shown in the drawing, in a fixed relationship to the rotation of the cylinder 5, for instance by a reduction gearing between the drive cylinder 5 and the shaft 18 so that the latter will be rotated at a considerably slower rotational speed than the cylinder 5.

The device includes further locking means for temporarily locking the reserve arm 15 in a turned position as shown in FIG. 3 to which the reserve arm is moved by the aforementioned transmission means. These locking means include a bar 33 pivotable about an axis 33a (FIG. 2) and carrying spaced from the axis 33a an upwardly extending projection 34 of substantially triangular configuration located in the path of the reserve arm as the latter is moved from the position shown in FIG. 2 to the position shown in FIG. 3.

The above-described apparatus will operate as follows:

In FIG. 1 the tube 4 is shown in the winding position in which the yarn 1 continuously supplied from the supply tube 2 passes over the reciprocating yarn guide 3 and is wound on the bobbin tube 4, which is made of cardboard or the like and which is rotated by the drive cylinder 5. When a full yarn package 14 is formed on the bobbin tube, the operator (whose hand is shown in FIG. 1) pivots the lever 13 towards the front.

This movement turns shaft 9 in clockwise direction and correspondingly moves the arms 8 of the bobbin tube supporting means from the position as shown in FIG. 1 to the position as shown in FIG. 3. During this turning of the arms 8, the projections 27 thereon will engage the arms 11 of the cradle to turn the same likewise to the position shown in FIG. 3. As the arms 8 of the bobbin tube supporting means approach the position as shown in FIG. 3, the slanted face 26a of the stationary cam 26 will engage the inner face of the left arm, as viewed in FIG. 1, to move the upper end thereof carrying the side plate 6 in outward direction so that the full bobbin tube will be released from the bobbin tube supporting means and be received in the semi-circular end portions 12 on the free ends of the cradle arms, as shown in FIG. 3. During such movement of the bobbin tube supporting means on the cradle, the yarn 1 will become disengaged from the yarn guide 3 and a portion of the yarn will be located on the suction opening 20 of the temporary yarn recovering means. The operator then cuts the yarn, for example by the cutting means or knife 23 positioned downstream of the orifice 20 by pressing a portion of the yarn downstream of the orifice against the cutting edge of the knife 23. The cut end of the yarn coming from the yarn supply tube 2 is then sucked through the suction orifice 20 into the waste receptacle 21.

As described above, transmission means are provided between the shaft 9 and the reserve arm 15 so that, as the arms 8 of the bobbin tube supporting means are turned by means of the handle 13 from the position shown in FIG. 1 to the position shown in FIG. 3, the cam 31 connected by the described'transmission means to the shaft 9 will be turned correspondingly so that the reserve arm 15 will be turned from the position shown in FIG. 1 to the position shown in FIG. 3. During such turning, the catch member 17 will engage the right face, as viewed in FIG. 3, of the wheel 19 and be tilted about its pivot axis so that the catch member 17 may pass over the wheel 19 during the turning of the reserve arm to the position as shown in FIG. 3. The shaft 16 and the reserve arm 15 connected thereto are arranged in such a manner that during turning of the reserve arm to the position as shown in FIG. 3 the hooked end 15a of the reserve arm will engage the yarn extending between the supply tube 2 and the suction orifice 20 so as to deflect the yarn as shown in FIG. 3. During such movement of the reserve arm 15 from the rest position, as shown in FIG. 1 to the turned position as shown in FIG. 3, the arm 15 will engage the inclined face 34a of the projection 34 on the bar 33 to thereby pivot the bar 7 33 about the pivot axis 33a so that the reserve arm 15 may pass the aforementioned projection, whereafter the arm 33, biased by gravity or by a spring, not shown,

to the position shown in FIG. 2, will return to this position so that the reserve arm 15 will be held in the position as shown in FIG. 3.

When a full bobbin is received by the cradle, as shown in FIG. 4, the bobbin tube supporting means, including the arms 8 and the side plates 6 and 7 carried thereby are returned by the operator to a substantially vertical position as shown in FIG. 4 and while in this position, a new cardboard tube 36 is inserted manually between the two side plates 6 and 7, which may include very short projections adapted to enter the open ends of the tube to centralize the latter and the side plates. After a new tube has thus been inserted between the side plates 6 and 7, the operator moves this tube to the position as shown in FIG. 5 into engagement with the drive cylinder 5. During this movement, the side plate 6 will engage the front end of the bar 33 to tilt the latter about the pivot axis 33a in downward direction, releasing thereby the reserve arm from the projection 34 so that the reserve arm will move from the turned position as shown in FIG. 4 back to its rest position shown in FIG. 1. It should be noted that during pivoting of the arms 8 from the position as shown in FIG. 3 to the position shown in FIGS. 1 and 5, the cam 31 will be returned to the position as shown in FIG. 2. During this movement of the reserve arm 15 from the position shown in FIG. 3 to the rest position as shown in FIG. 1, the teeth 6a on the side plate 6, rotating with the bobbin tube 4, by the friction between the side plate 6 and the end of the bobbin tube, will catch the yarn 1 while at the same time the catch member 17 on the reserve arm will engage in one of the slanted grooves 190 of the wheel 19 on the rotating shaft 18 so that the reserve arm will be temporarily moved in reverse direction and the yarn 1 will form a reserve tail in form of a plurality of windings 38 at the end of the tube 36 having a plurality of turns, going in one direction and a plurality of turns going in the other direction.

Since the wheel 19 is continuously rotated, the catch 17 will be shortly released from the groove 19a of the wheel 19 and the reserve arm 15 will then continue on its way back to the rest position as shown in FIG. 1. The yarn 1 becomes then engaged by the yarn guide 3 so that during further rotation of the bobbin tube, the first turns 39 of a yarn package are wound on the new bobbin 36, as shown in FIG. 7, without covering the reserve tail 38.

A yarn package 14 is thus formed on the new bobbin tube, and if the yarn package is wound to the desired diameter, the doffing operation above-described is again carried out.

FIGS. 8 and 9 illustrate elements of a second embodiment of the device according to the present invention, which replace the wheel 19 with the slanted grooves shown in the embodiment illustrated in FIGS. 1-7. It is to be understood that this second embodiment includes otherwise all of the elements as described in connection with FIGS. 1-7 and cooperating with each other in the manner as described above. The only difference between the above-described embodiment and the second embodiment is the replacement of the wheel 19 with the elements as shown in FIGS. 8 and 9 which will cooperate with the reserve arm 15 in the manner as will be described below to form a protected yarn reserve in which first a plurality of turns are wound in one direction on one end of the bobbin tube 4 and then in the opposite direction.

There is shown in FIG. 8 a disc 40 from which a hub 40b projects to the left side thereof, as viewed in FIG. 8, which surrounds the shaft 18 so that the disc 40 is axially movable and turnable relative to the shaft. A short hub 40c projects from the other side of the disc and this hub is provided with a plurality of circumferentially spaced pockets 41 for a purpose as will be described later on. The disc 40 has an engaging face 40a on the left side thereof, as viewed in FIG. 8, which includes an obtause angle a with the axis of rotation as the disc. The disc is further provided with a notch 42 extending from the outer periphery of the disc into the latter as clearly shown in FIG. 9. A collar 43 is fixed by a screw or the like to the shaft 18 for rotation therewith and axially spaced from the hub 40c of the disc 40. The collar 43 is provided with a hub portion 43a projecting toward the disc 40 and this hub portion is provided at the end face thereof facing the disc with a plurality of projections 44 circumferentially spaced from each other and adapted to engage into the pockets 41 on the hub portion 40c of the disc 40 when the latter is moved toward the right, as viewed in FIG. 8. A coil compression spring 45 between the hub portion 400 of the disc 40 and the collar 43 normally hold the projections 44 on the collar out of engagement with the pockets 41.

The elements shown in FIGS. 8 and 9 cooperate with the reserve arm 15 and the catch member 17 thereon in the following manner:

When the reserve arm 15 is released in its turned position from the locking member 34, in the manner as described above in connection with the embodiment shown in FIGS. I7, and turns from its turned position shown in FIG. 3 to its rest position as shown in FIG. 1, the catch member 17 will engage the engaging face 40a of the disc to move the latter axially towards the right, as viewed in FIG. 8, against the force of the coil spring 45 so that the projections 44 on the collar 43 will engage into the pockets 41 on the short hub portion 400 of the disc 40 and the latter will rotate with the shaft 18. During such rotation the arm 15 will be turned in clockwise direction, due to the inclination of the engaging face 40a of the disc which is likewise rotated in clockwise direction, so that a plurality of turns of a yarn reserve will be wound on the end of the bobbin tube 4 in one direction. When during rotation of the disc the catch member 17 reaches the notch 42, the catch member will pass through the notch and the arm 15 will continue on its way to its rest position and turn in counterclockwise direction whereby a plurality of additional turns of the yarn reserve are formed which are wound in the opposite direction to the first mentioned turns and cover the latter, to thereby form a protected" yarn reserve.

The textile machine according to the present invention includes also a sensor for sensing the tension of a yarn passing from the yarn supply tube to the winding apparatus. Such yarn tension sensors are well known in the art and such a sensor cooperates with a cutter actuated by the sensor when the yarn tension slackens.

It is essential to eliminate the action of such a sensor during the operation of replacing full bobbins by empty ones. Otherwise, as the yarn slackens during this replacing operation the sensor would actuate the yarn cutter which would cause the yarn to be broken at the respective work station and oblige the operator to refurnish the station.

Such a sensor and the elements cooperating therewith to render the sensor inoperative during movement of the bobbin tube supporting means from the winding to the release position and for rendering the sensor again operative during winding of the yarn on the bobbin tube to form a yarn package thereon is illustrated in FIGS. 1 1. It is to be understood that the arrangement only partially illustrated in FIGS. 1012 includes otherwise all the elements shown in the embodiment illustrated in FIGS. 1-7 and in which the wheel 19 on the shaft 18 is replaced by the elements as illustrated in FIGS. 8-9. It is further mentioned that the inlet tube 2 shown for instance in FIG. 1 closely adjacent to the yarn winding apparatus is actually spaced considerably therefrom so that a sensor and a cutter as will be described in the following part of the specification can be placed between the yarn inlet tube 2 and the winding apparatus.

As shown in FIGS. 10 and 11 there is provided in the textile machine according to the present invention a sensor 47 of known construction which includes a sheet metal housing 48 mounted on a beam of the frame F of the machine and formed with a cutout 48a of a configuration as best shown in FIG. 11. Connected to the housing are two guide bars 49 and 50 for guiding a yarn, not illustrated in these Figures, and passing from the yarn supply tube 2 shown for instance in FIG. 1 to the winding apparatus. The sensor 47 includes further a switch 50 of known construction including an elongated rod 51 opening and closing the switch 50 when the rod is tilted, in the manner as will be described later on, in one or the other direction. As shown in FIG. 10, the switch 50 is mounted laterally of the housing 48 of the sensor with the rod 51 extending into the housing between the guide bars 49 and 50, normally upwardly inclined relative to these guide bars. The switch 50 is connected by wires 52 to a cutter 53, only schematically illustrated in FIG. 11, which is located adjacent and downstream of the inlet tube 2 shown, for instance, in FIG. 1. The cutter 53 is of well known construction and may comprise a stationary cutter blade and a solenoid operated movable cutting blade to be moved to the operating position, cutting the yarn passing between the blades, when the switch 50 is moved by the rod 51 to the closed position. The yarn, not shown in FIGS. 10-12 passes under the guide rod 49 over the rod 51 of the switch 50 and under the guide rod 50 to the winding apparatus so that when the yarn is tensioned the rod 51 will be tilted downwardly and the switch 50 be in open condition, whereas when the yarn tension slackens the rod 51 will tilt upwardly to close thereby the switch 50 and to actuate the cutter 53.

As mentioned before it is essential that the action of the sensor, for energizing the cutter 53 to cut the yarn, be eliminated during moving of the bobbin tube 4 from the winding position as shown in FIG. 1 to the release position and the following doffing operation, in which the yarn tension evidently slackens, so that the cutter 53 is not actuated during this operation. During this operation, the bar 51 has therefore to be held in the same position as if it would be held by the tensioned yarn. To hold the bar 51 in the aforementioned position there are lever means provided which comprise, as best shown in the exploded view of FIG. 11 and the schematic side view of FIG. 12, a first angled lever 54 tiltable about a pivot pin 55 passing through an opening in the lever 54 and an aligned opening 56 in a bracket 57 mounted on the aforementioned part of the frame F in the position as shown in FIG. 10. The angled lever 54 is provided with two pins 58 and 59 projecting vertically spaced from each other to the right side, as viewed in FIG. 11 from the lever 54 and this lever has further an upwardly inclined extension 60 for a purpose as will be described later on. Closely adjacent to the first lever 54 and on the right side thereof, as viewed in FIG. 1 1, is a second lever 61 pivoted at one end thereof on a pivot pin 62 passing through aligned openings in the lever 60 and in an additional bracket 63 likewise mounted on the frame F. The second lever has at its front end thereof spaced from the pivot pin 62 an inclined face 61a adapted to engage the rod 51 to hold the rod in the same position as the same is held by the tensioned yarn passing over the rod. The two pins 58 and 59 on the lever 54 are respectively arranged to engage upper and lower edges of the second lever 61, as clearly shown in FIG. 12.

In order to move the lever 61 to the holding position in which its inclined face 61a engages the rod 51 to hold the latter in a position downwardly inclined from the position as shown in FIG. 11, the first lever 54 is connected at the end thereof distant from the pivot pin 55 by a rod 65 to the front end of a lever 66 which is pivotable about a pivot axis 67 at the other end thereof. The lever 66 is adapted to be engaged by a cam 68 fixedly mounted on the shaft 9 of the bobbin tube supporting means for rotation therewith and the cam 68 has an eccentric lobe portion 69 arranged in such a manner that when the bobbin tube supporting means are turned from the position shown in FIG. 1 to the position shown in FIG. 3 the lobe portion 69 will engage and tilt the lever 66 about its pivot axis I in counterclockwise direction to thereby tilt the first lever 54 correspondingly in clockwise direction about its pivot 55 so that the pin 58 engaging the upper edge of the second lever 61 will tilt the latter downwardly in counterclockwise direction about its pivot 62 so that the inclined front face 61a of the lever 61 will hold the rod 51 of the switch 50 in the same position as it would be held by a tensioned yarn passing thereover.

When, after removal of a bobbin tube with a full yarn package 14 thereon from the bobbin tube supporting means a new bobbin tube is inserted between the side plate 6 and 7 and the new bobbin tube is then moved to the winding position, and the winding of the yarn into the yarn package on the new tube is proceeding, the front face 61a of the lever 61 has to be disengaged from the rod 51 of the sensor so that the latter can perform its intended normal sensing position.

For this purpose the following arrangement is provided in the apparatus according to the present invention. As shown in FIG. 10 the shaft 16 which carries the reverse arm 15 for rotation therewith projects in this arrangement with an end portion 16' upwardly beyond the reserve arm 15 and carries on this upwardly projecting end portion a delaying arm 71 of L-shaped cross section having a horizontal portion which is adapted to slide over the arm 15 and a vertical portion 70" which is adapted to be engaged by the front face of the arm 15. The delaying arm 70 is freely turnable on the shaft 16 relative to the reserve arm 15 and a torsion spring 72 is wound about the projecting portion 16 of the shaft 16 and arranged to bias the vertical portion 70 into engagement with the front face of the arm 15. The delaying arm 70 is also provided with a catch member 73 mounted on its upper edge on the rear face of the vertical portion 70" of the delaying arm 70 tiltable about a tilting axis 73a. The catch member 73 can therefore tilt in counterclockwise direction about its tilting axis 73, while being prevented from tilting in clockwise direction about this tilting axis. The catch member 73 may normally be held in its vertical position, as shown in FIG. 10, simply by gravity or a torsion spring, not shown in the drawing wound about the tilting axis 73 and engaging with opposite ends the arm 70 and the catch member below the tilting axis thereof may be additionally used for normally holding the catch member 73 normally in its vertical position. The catch member 73 is spaced from the axis of the shaft 16 a radial distance different from the spacing of the catch member 17 on the reserve arm 15, and assuming that the shaft 18 rotates in counterclockwise direction, as indicated by the arrow X in FIG. 10, the radial distance of the catch members 73 from the axis of the shaft 16 has to be slightly longer, for a purpose which will be described later on, than the radial distance of the catch member 17 on the reserve arm 15 from the axis of the shaft 16. The horizontal portion 70 of the delaying arm 70 is provided with a projecting spur 71 projecting from the free end of the arm in the manner as shown in FIG. 10. FIG. indicates also partly an additional torsion spring 75 wound about the shaft 16 and connected at opposite ends thereof to a stationary support, not shown in FIG. 10, and to the shaft 16 so as to urge the shaft and the reserve arm fixedly connected thereto to the rest position as described above. It is to be understood that the shaft 16 carries at its lower end an arm 29 provided with a roller follower 30 as shown in FIG. 2 and cooperating with the cam 31 as described before.

The above-described arrangement will operate as follows:

During movement of the bobbin tube support means from the winding position as shown in FIG. 1 to the release position as shown in FIG. 3 and corresponding turning of the cam 31, the reserve arm will be turned from its rest position to its turned position whereby the front face of the reserve arm 51 will engage the vertical portion 70" of the delaying arm 70 and take the latter along against the force of the torsion spring 72 so that both arms will in the turned position be arrested by the locking means 34 in the manner as described before. When a new bobbin tube 36 is palced again in the winding position as shown in FIG. 5, the locking means 34 are released, as described before, and both arms will be moved back under the influence of the torsion springs 72 and 75 towards their rest position. When the catch member 17 on the reserve arm 15 engages the engaging face of the disc 40 both arms will be arrested and turned back in clockwise direction, in the manner as described before, until the catch member 17 on the reserve arm 15 passes through the notch 42 in the disc 40 to thereafter continue its move to its rest position. Since the radial distance of the catch member 73 from the axis of the shaft 16 is slightly larger than the radial distance of the catch member 17 on the reserve arm 15, the delaying arm 70 will be held by the engaging face of the disc 40 while the catch member 17 on the reserve arm 15 passes through the notch 42 and the catch 73 on the delaying arm 70 will pass through the notch only after the shaft 18 on which the disc 40 is mounted has made an additional nearly full revolution. FIG. 10

shows the arm 15 already turned to its rest position while the arm is held'by the catch member 73 thereon engagi ng'the disc 40. When the disc 40 has turned through a further revolution, the catch member 73 will pass through the notch 42 in the disc and the arm 70 will be turned by the coil spring 72 to its rest position in which its spur 71- will engage the upwardly extending projection 60 on'the lever'54 to turn the latter about the pivot pin 55 in counterclockwise direction so that the pin 59 on the lever 54 engaging the bottom edge of the lever 61 will turn the latter in clockwise direction about its pivot pin 62 so that the front face 61a of the lever 61 will become disengaged from the rod 51 of the sensor and upwardly spaced therefrom so that the sensor can again perform its normal sensing function.

The disc 40 on the shaft 18 cooperates therefore with the delaying arm 70 to render the sensor 47 again operative during winding of a yarn on the bobbin tube to form a yarn package thereon.

The device for forming a yarn reserve on a bobbin tube during a winding operation cooperates therefore with the sensor of the textile machine for rendering the sensor inoperative during the doffing operation and for rendering the sensor inoperative during the normal winding operation.

Although the invention has been described particularly with regard to application to false twisting texturizing machines, it will be understood that each of the elements described above or two or more together may also find useful application in other types of textile machines.

While the invention has been illustrated and described as embodied in a device on a textile machine for forming a yarn reserve on a bobbin tube during the winding operation and a yarn textile sensor cooperating with the device, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:

1. In a textile machine, a combination, including a device for forming a yarn reserve at one end of a bobbin tube and comprising support means supporting a bobbin tube rotatable about its axis and tiltable about a pivot axis substantially parallel to the bobbin tube axis between a winding position and a release position; drive means cooperating with said bobbin tube for rotating the same, when in said winding position, about its axis; a first shaft substantially parallel to said pivot axis and rotated at a substantially slowerspeed than said bobbin tube is rotated by the drive means; a disc freely turnable mounted on said first shaft movable in axial direction thereof and having an engaging face including an obtuse angle with the axis of said first shaft and a notch extending inwardly from the periphery thereof; means biasing said disc along the axis of said first shaft in a first direction to a disengaged position; coupling means comprising cooperating portions on said disc and said first shaft for coupling said disc for rotation with said first shaft upon moving of the disc against said biasing means in a second direction opposite to said first direction to an engaged position; a second shaft extending transverse to said pivot axis and having a reserve arm fixed at one end to and projecting substantially normal from said second shaft, said second shaft and said arm thereon being tumable between a rest position and a turned position, said arm having at the free end thereof a hooked yarn guide adapted to engage a yarn during turning of said arm from said turned to said rest position for winding the yarn on one end of said bobbin tube and to form a yarn reserve thereon; transmission means between said bobbin tube support means and said second shaft for turning the latter and said arm thereon from said rest to said turn position during tilting of said support means from said winding to said release position; yieldable locking means for locking said arm in said turn position and for releasing said arm when said support means is moved back to said winding position; biasing means biasing said second shaft and said arm thereon to return from said turned to said rest position after said locking means has released said arm; and engaging means carried by said arm intermediate the ends of the latter and arranged to engage said engaging face of said disc during movement of said arm from said turned to said rest position to move said disc to said engaged position so that the disc is rotated to thereby move said arm in a direction toward its turned position until said engaging means passes through said notch in said disc, whereby successive portions of said yarn reserve are wound in opposite directions and cover each other.

2. A combination as defined in claim 1, wherein said locking means comprises a bar pivotable about an axis transverse of the axis of said second shaft between a locking and a releasing position and carrying a locking member for locking said arm in said turned position.

3. A combination as defined in claim 2, wherein said locking member is wedge-shaped and projects upwardly from said bar.

4. A combination as defined in claim 3, wherein said support means has a pair of flanges on opposite sides of said bobbin tube, one of which is arranged to engage said bar, when said support means is in said winding position, to tilt the bar portion carrying said locking member downwardly to thus release said arm.

5. A combination as defined in claim 1, wherein said engaging means on said arm comprises a catch member pivotally connected along an upper edge thereof to an upper edge of said arm on the side of the latter which trails during movement of said arm from said rest to said turned position and having a lower portion extending downwardly below said arm so that said catch member tilts over said disc during turning of said arm from said rest to said turned position, while during movement of said yarn from said turned to said rest position, said lower portion of said catch member will engage said engaging face of said disc.

6. A combination as defined in claim 1, and including sensor means for sensing the presence and tension of the yarn; yarn cutting means upstream of said sensor means for cutting said yarn when said sensor means senses slackening of said yarn; and means on' said device for rendering said sensor means inoperative during movement of said support means from said winding to said release position and for rendering said sensor means operative during winding of the yarn on the bobbin tube to form a yarn package thereon.

7. A combination as defined in claim 6, wherein said sensor means comprises a rod adapted to be engaged by said yarn and being movable by said yarn, when the latter is under tension, from a first to a second position and moving to said first position when the yarn tension slackens to close in said second position a circuit energizing said yarn cutting means; lever means movable between a holding position engaging said rod and holding said rod in said second position and a releasing position disengaged from said rod; second transmission means between said support means and said lever means for moving the latter to said holding position when said support means is moved to said release position; and delaying arm means mounted on said second shaft for moving said lever means to said releasing position after said reserve arm has moved back to said rest position.

8.-A combination as defined in claim 7, wherein said delaying arm means comprises a delaying arm mounted at one end thereof on said second shaft projecting substantially normal to the latter and freely pivotable about the axis thereof, additional biasing means biasing said delaying arm into engagement with said reserve arm, second engaging means on said delaying arm spaced from the axis of said second shaft a distance slightly different than the spacing of the engaging means on said reserve arm from said axis so that when said engaging means on the reserve arm passes through said notch in said disc, said engaging means on said delaying arm will engage said engaging face of the disc and pass through said notch only after said disc has made an additional substantially full revolution, and means on said delaying arm engaging said lever means for moving the latter from said engaging to said releasing position after said engaging means on said delaying arm has passed through said notch.

9. A combination as defined in claim 8, wherein said lever means comprises a first lever provided with an upwardly extending projection and a second lever adjacent said first lever and provided at one end thereof with an inclined face adapted to engage said rod, both levers are tiltable about pivot axes spaced in the longitudinal direction of said levers from each other, means on one of said levers for tilting the other lever upon tilting of said one lever, additional transmission means between said bobbin tube supporting means and said first lever to tilt, during pivoting of the support means from said winding to said release position, said second lever in a direction in which said inclined face thereof engages said rod to hold the latter in the same position as when engaged by a tensioned yarn.

10. A combination as defined in claim 9, wherein said delaying arm, after being released from said disc, engages with a portion thereof said upwardly extending projection of said first lever to turn the latter and said second lever in a direction to space said slanted face on said second lever upwardly from said rod.

11. A combination as defined in claim 10, wherein said delaying arm has an L-shaped cross section having a substantially horizontal portion and a vertical portion, said horizontal portion being provided at the free end thereof with a projecting spur forming said portion of said second lever adapted to engage said projection on said first lever. 

1. In a textile machine, a combination, including a device for forming a yarn reserve at one end of a bobbin tube and comprising support means supporting a bobbin tube rotatable about its axis and tiltable about a pivot axis substantially parallel to the bobbin tube axis between a winding position and a release position; drive means cooperating with said bobbin tube for rotating the same, when in said winding position, about its axis; a first shaft substantially parallel to said pivot axis and rotated at a substantially slower speed than said bobbin tube is rotated by the drive means; a disc freely turnable mounted on said first shaft movable in axial direction thereof and having an engaging face including an obtuse angle with the axis of said first shaft and a notch extending inwardly from the periphery thereof; means biasing said disc along the axis of said first shaft in a first direction to a disengaged position; coupling means comprising cooperating portions on said disc and said first shaft for coupling said disc for rotation with said first shaft upon moving of the disc against said biasing means in a second directIon opposite to said first direction to an engaged position; a second shaft extending transverse to said pivot axis and having a reserve arm fixed at one end to and projecting substantially normal from said second shaft, said second shaft and said arm thereon being turnable between a rest position and a turned position, said arm having at the free end thereof a hooked yarn guide adapted to engage a yarn during turning of said arm from said turned to said rest position for winding the yarn on one end of said bobbin tube and to form a yarn reserve thereon; transmission means between said bobbin tube support means and said second shaft for turning the latter and said arm thereon from said rest to said turn position during tilting of said support means from said winding to said release position; yieldable locking means for locking said arm in said turn position and for releasing said arm when said support means is moved back to said winding position; biasing means biasing said second shaft and said arm thereon to return from said turned to said rest position after said locking means has released said arm; and engaging means carried by said arm intermediate the ends of the latter and arranged to engage said engaging face of said disc during movement of said arm from said turned to said rest position to move said disc to said engaged position so that the disc is rotated to thereby move said arm in a direction toward its turned position until said engaging means passes through said notch in said disc, whereby successive portions of said yarn reserve are wound in opposite directions and cover each other.
 2. A combination as defined in claim 1, wherein said locking means comprises a bar pivotable about an axis transverse of the axis of said second shaft between a locking and a releasing position and carrying a locking member for locking said arm in said turned position.
 3. A combination as defined in claim 2, wherein said locking member is wedge-shaped and projects upwardly from said bar.
 4. A combination as defined in claim 3, wherein said support means has a pair of flanges on opposite sides of said bobbin tube, one of which is arranged to engage said bar, when said support means is in said winding position, to tilt the bar portion carrying said locking member downwardly to thus release said arm.
 5. A combination as defined in claim 1, wherein said engaging means on said arm comprises a catch member pivotally connected along an upper edge thereof to an upper edge of said arm on the side of the latter which trails during movement of said arm from said rest to said turned position and having a lower portion extending downwardly below said arm so that said catch member tilts over said disc during turning of said arm from said rest to said turned position, while during movement of said yarn from said turned to said rest position, said lower portion of said catch member will engage said engaging face of said disc.
 6. A combination as defined in claim 1, and including sensor means for sensing the presence and tension of the yarn; yarn cutting means upstream of said sensor means for cutting said yarn when said sensor means senses slackening of said yarn; and means on said device for rendering said sensor means inoperative during movement of said support means from said winding to said release position and for rendering said sensor means operative during winding of the yarn on the bobbin tube to form a yarn package thereon.
 7. A combination as defined in claim 6, wherein said sensor means comprises a rod adapted to be engaged by said yarn and being movable by said yarn, when the latter is under tension, from a first to a second position and moving to said first position when the yarn tension slackens to close in said second position a circuit energizing said yarn cutting means; lever means movable between a holding position engaging said rod and holding said rod in said second position and a releasing position disengaged from said rod; second transmission meAns between said support means and said lever means for moving the latter to said holding position when said support means is moved to said release position; and delaying arm means mounted on said second shaft for moving said lever means to said releasing position after said reserve arm has moved back to said rest position.
 8. A combination as defined in claim 7, wherein said delaying arm means comprises a delaying arm mounted at one end thereof on said second shaft projecting substantially normal to the latter and freely pivotable about the axis thereof, additional biasing means biasing said delaying arm into engagement with said reserve arm, second engaging means on said delaying arm spaced from the axis of said second shaft a distance slightly different than the spacing of the engaging means on said reserve arm from said axis so that when said engaging means on the reserve arm passes through said notch in said disc, said engaging means on said delaying arm will engage said engaging face of the disc and pass through said notch only after said disc has made an additional substantially full revolution, and means on said delaying arm engaging said lever means for moving the latter from said engaging to said releasing position after said engaging means on said delaying arm has passed through said notch.
 9. A combination as defined in claim 8, wherein said lever means comprises a first lever provided with an upwardly extending projection and a second lever adjacent said first lever and provided at one end thereof with an inclined face adapted to engage said rod, both levers are tiltable about pivot axes spaced in the longitudinal direction of said levers from each other, means on one of said levers for tilting the other lever upon tilting of said one lever, additional transmission means between said bobbin tube supporting means and said first lever to tilt, during pivoting of the support means from said winding to said release position, said second lever in a direction in which said inclined face thereof engages said rod to hold the latter in the same position as when engaged by a tensioned yarn.
 10. A combination as defined in claim 9, wherein said delaying arm, after being released from said disc, engages with a portion thereof said upwardly extending projection of said first lever to turn the latter and said second lever in a direction to space said slanted face on said second lever upwardly from said rod.
 11. A combination as defined in claim 10, wherein said delaying arm has an L-shaped cross section having a substantially horizontal portion and a vertical portion, said horizontal portion being provided at the free end thereof with a projecting spur forming said portion of said second lever adapted to engage said projection on said first lever. 